Alexander Mustill
Researcher
TOI-1130: A photodynamical analysis of a hot Jupiter in resonance with an inner low-mass planet
Author
Summary, in English
The TOI-1130 is a known planetary system around a K-dwarf consisting of a gas giant planet, TOI-1130 c on an 8.4-day orbit that is accompanied by an inner Neptune-sized planet, TOI-1130 b, with an orbital period of 4.1 days. We collected precise radial velocity (RV) measurements of TOI-1130 with the HARPS and PFS spectrographs as part of our ongoing RV follow-up program. We performed a photodynamical modeling of the HARPS and PFS RVs, along with transit photometry from the Transiting Exoplanet Survey Satellite (TESS) and the TESS Follow-up Observing Program (TFOP). We determined the planet masses and radii of TOI-1130 b and TOI-1130 c to be Mb = 19.28 ± 0.97M⊕ and Rb = 3.56 ± 0.13 R⊕, and Mc = 325.59 ± 5.59M⊕ and Rc = 13.32−1.41+1.55 R⊕, respectively. We have spectroscopically confirmed the existence of TOI-1130 b, which had previously only been validated. We find that the two planets have orbits with small eccentricities in a 2:1 resonant configuration. This is the first known system with a hot Jupiter and an inner lower mass planet locked in a mean-motion resonance. TOI-1130 belongs to the small, yet growing population of hot Jupiters with an inner low-mass planet that poses a challenge to the pathway scenario for hot Jupiter formation. We also detected a linear RV trend that is possibly due to the presence of an outer massive companion.
Department/s
- Astrophysics
Publishing year
2023-07-01
Language
English
Publication/Series
Astronomy & Astrophysics
Volume
675
Document type
Journal article
Publisher
EDP Sciences
Topic
- Astronomy, Astrophysics and Cosmology
Keywords
- planetary systems
- planets and satellites: individual: TOI-1130
- techniques: photometric
- techniques: radial velocities
- Astrophysics - Earth and Planetary Astrophysics
Status
Published
Project
- Consolidating CHEOPS and preparing for PLATO: Exoplanet studies in the 2020s
- A unified picture of white dwarf planetary systems
ISBN/ISSN/Other
- ISSN: 1432-0746